Knocking 
To dream of knocking represents the attempt of your subconscious to bring a certain aspect of your life to greater consciousness. This may also mean the coming of a new opportunity.
Knocker
A door knocker in a dream symbolizes an opportunity. You may have a choice presented to you in which you are called to take action and take risks with the hope of success.
Demolition
To dream of a demolition suggests that an experience of complete deconstruction of a strongly held idea may be occurring in your waking life. Although there may be a sense of loss associated with a demolition dream, there is also the indication of rebirth. Be aware of what is being demolished, as this will give you an idea of how to approach the next step in your life.
Poltergeist
To dream of a poltergeist, whether seen or heard, indicates that one is experiencing a lack of control over their life. It may be that some aspects of your life are interfering with your goals.
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